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| Naji, M. |
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| Ertürk, Emre |
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| Azam, Siraj |
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Zhang, Lin
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Topics
Publications (13/13 displayed)
- 2024Oxygen concentration – a governing parameter for microstructural tailoring of duplex AlCrSiON coatings for superior mechanical, tribological, and anti-corrosion performancecitations
- 2021Designing tubular conducting polymer actuators for wireless electropumpingcitations
- 2019CO2 photoelectrochemical reduction in room-temperature ionic liquids-based media evaluated by Scanning Electrochemical Microscopy
- 2018Locally Addressed Photoelectrocatalysts for CO2 Reduction in NonconventionalSolvents
- 2016Electrografting of 3-Aminopropyltriethoxysilane on a Glassy Carbon Electrode for the Improved Adhesion of Vertically Oriented Mesoporous Silica Thin Filmscitations
- 2014Perceived and performance-based executive dysfunction in Parkinson's diseasecitations
- 2014Anisotropic elasticity of silicon and its application to the modelling of X-ray opticscitations
- 2009Sensing properties of germanate and tellurite glass optical fibrescitations
- 2009Fiber Bragg gratings inscribed using 800nm femtosecond laser and a phase mask in singleand multi-core mid-IR glass fibers
- 2009Fiber Bragg gratings inscribed using 800nm femtosecond laser and a phase mask in single- And multi-core mid-IR glass fiberscitations
- 2005Strain and temperature sensitivity of a single-mode polymer optical fibercitations
- 2005Strain and temperature sensitivity of a single-mode polymer optical fiber
- 2000First in-vivo trials of a fibre Bragg grating based temperature profiling systemcitations
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article
Oxygen concentration – a governing parameter for microstructural tailoring of duplex AlCrSiON coatings for superior mechanical, tribological, and anti-corrosion performance
Abstract
This study investigates the impact of increasing oxygen levels on physical, structural, and mechanical properties and tribological performance of duplex AlCrSiON coatings. AISI H13 steel and tungsten carbide substrates are coated using arc ion plating with increasing oxygen flow rates up to 200 sccm to deposit coatings with varying oxygen concentrations. High-resolution transmission electron microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and three-dimensional optical profilometry are used to study morphological and structural properties. Correspondingly, the coatings are assessed for hardness, adhesion strength, friction coefficient, and resistance against corrosion and wear. A 50 to 100 sccm oxygen flow rate appeared as an optimal range to receive lower surface roughness. Generally, the addition of oxygen has compromised hardness and friction coefficient but adhesion strength, wear and corrosion resistance improve with increasing oxygen concentrations. The immersion tests have identified pitting corrosion as a dominating failure mechanism for AlCrSiON coatings when exposed to molten A380 aluminium alloy. This corrosion resistance stemmed from their dense columnar microstructure, excellent thermal stability, the fcc-(Al, Cr)2O3 phase structure, and the presence of compact Cr2O3 and Al2O3 nanocrystals. This study demonstrates that controlled oxygen concentration is a crucial parameter for tuning the microstructure of AlCrSiON coatings to achieve superior mechanical, tribological, and anti-corrosion performance, particularly for high-pressure die-casting applications.